Excitation probability resonant

Fig. 9.34 Monitoring of inelastic excitations by nuclear resonant scattering. The sidebands of the excitation probability densities for phonon creation, S(E), and for annihilation, S —E), are related by the Boltzmann factor, i.e., S(—E) = S E) tTvp —Elk T). This imbalance, known as detailed balance, is an intrinsic feature of each NIS spectrum and allows the determination of the temperature T at which the spectrum was recorded...

In conclusion, we present a spectroscopic study of nn excitation in trans-Stilbene in a molecular beam experiment. The excitation involves a 1+1 REMPI scheme following the interaction of the molecule with femtosecond UV laser pulses. When the excitation is resonant with the origin of the intermediate Si state, the measured photoelectron distribution reveals a maximum probability for the 0-0 transition. For higher photon energies (266nm) the photoelectron spectrum exhibits a rather complex distribution, due to the excitation of an alternate (C-C) stretching mode. 

Fig. 2. Excitation spectrum of the 1/S o —> 3 Po resonance of a single indium ion obtained in optical-optical double resonance using electron shelving. The linewidth of the fitted lorentzian is 170 Hz FWHM. The average excitation probability in the peak is about 10% and the total measuring time was 30 minutes...

The measured NRVS signal is proportional to the number of resonant Fe nuclei in the effective sample volume and to an excitation probability ... 

Fig. 7.8 also shows the results of a classical calculation and a quantum calculation that both confirm the prediction of the giant resonance based on the simple overlap criterion discussed above. The crosses in Fig. 7.8 are the results of classical Monte Carlo calculations. They were performed by choosing 200 different initial conditions in the classical phase space at Iq = 57. The ionization probabihty in this case was defined as the excitation probability of actions beyond the cut-off action Ic = 86. This definition is motivated by experiments that, due to stray fields and the particular experimental procedures, cannot distinguish between excitation above Ic > 86 and true ionization, i.e. excitation to the field-free hydrogen continuum. The crosses in Fig. 7.8 are close to the full line and thus confirm the model prediction. The open squares are the results of quantum calculations within the one-dimensional SSE model. The computations were performed in the simplest way, i.e. no continuum was... 

In an ensemble of two-level atoms, all of them may be initially prepared in state 0, and driven by a long pulse of radiation resonant with the transition 0 -> 1. When we neglect relaxation, for simplicity, the excitation probability for each atom... 

The result of the analysis in the excitation-energy region between 5.05 and 5.2 MeV is shown in Fig. 5.15, where the prompt fission probability is displayed (panel a) together with the results of a fit by rotational bands similar to the procedure described above for the upper resonance region. Again the spin-dependent excitation probabilities of the rotational band members were based on DWBA calculations by Back et al. (1971) for E " = 5.1 MeV. 

A common situation is that, AEyit < F < AEeiec where AE iec and AEyib are respectively the energy spacing between electronic levels and vibrational levels. In such a case scattering event proceeds via a single electronic resonance state, no- However it involves a number of vibrational states Xv belonging to the same electronic resonance state, no. Consequently the sum over electronic energy levels, n, can be omitted from the sum in the expression for the resonant part of the excitation probability in Eq. (13) ... 

In Figs 1 a,b we represent the electron-if2 scattering cross section and the phase of the corresponding excitation probability amplitude. The widths of the peaks in Fig. la are 2 — 3 times narrower than the width of the H2 resonance states. The phase shows an oscillatory behavior similar to the behavior of the transition probability amplitude phase as measured in the experiments of an electron passing through a quantum dot [15]. 

Recently, Ligare et al. confirmed the diketo character of the broad absorption of both U and T by IR-UV DRS. Their spectra showed ion gain rather than dips upon IR excitation. Double resonant spectroscopy relies on the fact that the bum laser changes the ground state vibrational distribution and thus the overall Franck-Condon (FC) factors. When the probe laser is timed to a strong resonance, this invariably leads to ion dip. However, in the case of a broad absorption, the consequences of modified FC factors are not always predictable and an ion dip may not necessarily occur. In the case of U and T, it is probable that there is a large... 

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